Interrupter for electric ignition-machines.



M. SCHKFER.

INTERRUPTER FOR ELECTRIC IGNITION MACHINES.

APPLICATION FILED FEB.8, 1912.

PatentedlJuly 21, 19%

3 SHEETS-SHEET 1.

M. scHAPER.

INTERRUPTER FOR ELECTRIC IGNITION MACHINES.

APPLICATION FILED FEB.B. 1912.

Patented July 21, 1914.

3 SHEETSSHEET 91.

M. SCHZSFER. INTBRRUPTER FOR ELECTRIC IGNITION MACHINES.

APPLIOATION FILED FEB.8, 1912.

1,104,007, Patented July 21, 1914.

3 SHEETS-SHEET 3.

. To all it may concern UNITED STATES PATENT OFFICE.

MAX scHliFER, or STI'ITTGART, GERMAN-Y, ASSIGNOR TO THE FIRM or ROBERT BOSCH, or STUTTGART, GERMAJvY.

INTERRUPTER FOR. ELECTRIC xemrxommcnmns.

Be it known that I, Max ScHlirER, a subject of the Emperor of Germany, residing at 107 Aeussere Biichsenstrasse, Stuttgart, Germany, have invented certain new and useful Improvements in Interrupters for Electric Ignition-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention,-such as will enable others skilled in the art towhich it ap rtains to make and use the same. v This invention relates to interrupters' for electric ignition machines for the ignition of combustible gases internal combustion engines, and is particularly directed to mechanis'm'which permits the adjustment of the period ofjgmtion, said mechanism forming a part of the casing" for the interrupter and being connected to a stationary part of the casing so that it is reliably held therein in any position to which it may be turned to advance or retard the spark and also so that it may be easily removed therefrom for in-' spection or repair of the interrupter parts. Interrupters of this kind are usaully located on the prolongation of the armature shaft of the electric ignition machine and they sometimes have a rotatable lever provided with a platinum contact which is normally held by a spring in engagement with another rotatable contact. These interrupter parts are generally incased and during operation .t-h ey cooperate with actuating cams for periodically separating the contacts to terrupt the electric ignition circuit. In

order to adjust the period of ignition with interrupters heretofore customary, the actuating cams were carried by a cam-ring adapted to be turned independently of the casing to a position corresponding to the adjustment desired.

It is essential in all forms of interrupters that the parts incased should be readily accessiblc without the use of special tools for inspection and repair and that the adjustable part should turn easily during the period of adjustment but should be reliably held in any adjusted position. The present invention contemplates forms of construction which fulfilall of these requirements by employing a casing for the interrupter comprising a stationary part with a peripheral offset in the formof a groove or a ledge, an adjustable part having cooperating ofi'set -.and a spring fitting the ofi'sets toholdjthe Specification. of Letters Patent.

. Application filed February a, 1912. serin'no. 676,473.

by a spring 18.

two casing parts together in any pgsition to which the ad ustable part may turned.

, Furthermore, thespring is deformable and of such form and so arranged that the adustable part of the casing may be withdrawn axially from 'the stationa part at any position of adjustment in or er to expose the interrupter parts. In the accompanying drawings illustratmg several modifications of my invention, F gure l is a longitudinal "section on line 1'-1 of Fig.3 through an interrupter; Fig.

,2 is a section on line 22 of Fig. 1, also showing in outline a magneto to which the nvention may be readily applied; Fig. 3 is an elevation of the interrupter with the cover of the casing removed, Fig. 4 is a section on line 44 o'f Fig. 5 of a modified .form of construction within the invention,

with the interrupterparts omitted; Fig. 5

is a. section on line 55 of Fig. 4, showing the casing combined with a. magneto; Fig. ois an elevation, in half section, of another modification within my invention; Fig. 7 is an elevation of the casing of Fig. 6, applied to a magneto; Fig.8 is an elevation, partly in section, on line 8-8 of Fig. 9, of another modification within my invention; Fig. 9 is a section on line 9-9 of Fig. 8 of the casing combined with a magneto; Fig. 10 is a longitudinal section showing another form of construction for holding the stationary and adjustable casing parts together; ..-nd Fig.

1 and 2 does not form any part of this in vention and is illustrated merely to indicate the practical application thereof.

Upon a disk 13 fastened to the armature shaft 12 is screwed an insulated metal block 14 which carries one of the interrupted contacts 15. The cooperating contact 16 is mounted at the end of a bent lever 17 which can rock upon a in that is covered in Fig. 3 he lever 17 carries a block of-fibre 19 and a bow-shaped leaf spring 20,

.one end of which-is attached at 21 to the disk 13. and holds thelever 17in such posi- Patented July 21, 1914.. i

tion that the contacts and 16 are normally pressed into engagement with each other. The actuating cams 22 project into the path of the fiber block 19, and when the shaft 12 is rotated the fiber block 19 periodically engages them so that the lever 17 is rocked against the stress of the spring 20 thereby separating the two contacts-15 and 16 and interrupting the electric circuit-of the mag neto 23. If the adjustable casing part a is turned relatively to "the stationary casing part b, the period of interruption and therefore the period of ignition may be adjusted to any desired advanced or retarded position within the range of adjustment.

In Figs. 1 to 3, the projecting rim of the stationary casing art I; encompasses the edge of the adjustaijle casing .part a, and the peripheral offsets in the form of registering grooves are cut in the opposite surfaces of these parts. The split spring d is bowed outwardly at c, Fig. 2, and projects into the peripheral recess-of the stationary casin part b, whereby thespring is revente from turning when the ad ustabecasing parta is turned by the adjusting rod fas'} tened to 6. The spring d has its section so arched that it projects also into the oove of the adjustable casingpart a and m this manner" holds the two partsitoge'thergin' any N position" to which i the adjustable part is turned.' Furthermore, as a result of the fact that the sprin (1 may be slightly deformed the adjusta le casing part maybe GTs pring d is used instead of a flat spring. in

faces.

passed and held together by an annular withdrawn axially from the stationary part of any position of adjustment, simply by pullin on it with suflicient force to disengage t ie two parts, i

In the modification shown in Figs. 4 and 5, the peripheral grooves for the spring d are on the inner surface of the adjustable casing part a and the outer surface of the stationary casing part b. The spring (1 is split at one place and engages on the twosides of the lug c, which projects within the groove on the stationary casing part, so that the spring cannot turn when the adjustable casing part is being turned.

In the modification shown in Figs. 6 and '7, the previously described peripheral grooves on the casing parts are replaced by the ledges e and f, which are so constructed that the casing parts fit along their flat sur- Both of these ledges are encomspring bent in cross section into the form of a cup ortrough. As in Figs. 4 and 5, the spring d'of this modification is split and abuts against the lug c on the stationary casing part b, so that the spring cannot turn when the adjustable casing part a is turned.

The modification shown in Figs. 8 and 9 differs from Figs. 1 to 3 in that a helical order to hold the helical sprin (1 in one of the casing parts, for instance the adjustable part a, there may be inserted within the spring, a smooth split wire ring which is under sufiicient stress-to hold the helical spring in the groove of the adjustable part, when the; ad ustable part is being x withdrawn.

In Figs. 10 and 11, the locking mechanism consists of two parts, a split ring (I and a bowed leaf spring 9 of polygonal form, likewisesplit. at oueplace. .In theposition shown in the drawing, the straight line parts of spring g crowd the ring d inwardly. If the adjustable casing part a is placed within the stationarycasing part b, the straight line partsof spring 9 yield and are forced into the peripheral groove on the inner surface of the stationary casing part. However, as soon as the peripheral rooye on the outer-[surface of the-adjusta le casingparta comes opposite the ring d,"-"the ring pressed by the'spring 9. into the groove and thereby locks the two casing parts together I in any position to which the adjustable partmay be turned. The adjustable casing part a maybe withdrawn axially from the stationary casing part b atnny position of adjustment simply aa ar-the vom f-constrilction.-s [Having thus described my inventlon what Ielaim is:

1. In combination with an interrupter for an electric: ignition machine, a casing for the interrupter comprising a stationary part, an adjustable part, and a deformable spring fric'tionally engaging both of said parts to hold them together in any position towhich the adjustable partinay beturned.

2. In combination with an interrupter for electric ignition machines, a quickly detachablecasing for the interrupter comprising a stationary part, an adjustable part, and locking mechanism frictionally engaging both of said pa-rts at any position to which the adjustable part may be positioned, said locking mechanism being disengageable by pulling the adjustable part axially.

3. In combination with an interrupter for an electric ignition machinc, a casing for the interrupter comprising a stationary part provided with a peripheral otfset, an adjustable part provided ith a peripheral offset and carrying an actuating cam for the interrupter contacts," and a spring fitting said peripheral ofi'sets to hold the two parts together at any position to which the adjustable part may beturned.

4. In combination with an interrupter for an electric ignition machine, a casing for interrupter contacts, and a deformable spring fitting said peripheral oflsets to disengageubly hold the two parts together at any posit-ion to which the adjustable part may be turned.

5. In combination with an interrupter-for an electric ignition machiriefa casing for the interrupter comprising a stationary part provided with a peripheral offset, an adjustable part provided with a peripheral ottset and carrying an actuating cam for the interrupter contacts, a. lug extendin within the peripheral ofl'sets of one of said parts, and a split spring fitting said peripheral olfsets and abutting against said lug to hold.

the two parts together at any position to which the adjustable part may be turned.

6. In combination with an interrupter for an electric ignition machine, a casing for the interrupter comprising a stationary part provided'with tin-exterior peripherai ledge, an ad'ustable part provided with an exterior perip eral ledge and carrying an actuating cam for the interrupter contacts, :1 lug on one ofi said parts, and a deformable split spring encompassing'said ledges and abutting said lug to disenga'geably hold the two parts together at any; position to which the adjustable part may betturned.

In testirnon whereof I afiix my signature, in presence 0 two witnesses.

MAX soHAFER.

Witnesses:

Max ANscnUTz, PAUL Vt'oLram.

co m o! thh tut my be obtdned tor five cents each, by addressing the Communion" a! faults. Wnhlnzton, D. 0." 

